DOS is a general acronym for "Disk Operating System", though it came to refer to the operating system used in the IBM PC, particularly Microsoft's MS-DOS.
For this lesson we are going to fill in a couple of concepts that we will need before we go further with directories. Wildcards can let you look for files and directories without specifying the complete name, and look for items with similar names or file extensions. And file attributes are an important part of file management.
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